Siemens SIRIUS 3RM1 Manual page 123

Step
Note
Third busbar
If you use a third busbar, you must rotate it in the same way as the first busbar, and mount it
so that it overlaps the second busbar.
Note
Free slots due to derating
If a clearance is left between the devices for thermal reasons, three terminal lugs (= one slot)
must always remain free.
Note
Busbar connection points
A motor starter must be plugged into the connection points of the busbars. Observe this in
the case of gaps stipulated for derating purposes, and select appropriate busbars.
SIRIUS 3RM1 motor starter
Manual, 06/2016, A5E0345285095020A/RS-AE/005
Operating instruction
1 Connect the main circuit L1, L2 and L3 to the infeed terminal. Tighten the screw terminals
with 0.6 to 0.8 Nm. Pull on the cables to ensure they are screwed tight.
2 Plug the first busbar into the rear screw terminals on the underside of the device.
The first three terminal lugs must be assigned here to the first device on the extreme left.
3 Plug the infeed terminal into the screw terminals of the first device together with the busbar
from Step 1.
5 Mount the second busbar rotated through 180°.
The first three terminal lugs overlap here with the last three terminal lugs of the first
busbar, and are mounted in the same device.
4 Tighten the screw terminals with 0.6 to 0.8 Nm. Pull on the busbars to ensure they are
screwed tight.
6.7 Connecting the infeed system (option)
Connection
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